1971—2000年中国陆地植被净初级生产力的模拟

利用植被与大气相互作用模式(AVIM),基于气象台站的观测资料模拟了1971—2000年中国陆地生态系统NPP的变化特征.结果表明:1971—2000年我国陆地植被年均NPP变化范围在0~987.67 gC·m^-2·a^-1,全国平均值为349.74 gC·m^-2·a^-1,30 a呈现出递增的变化趋势.对各类植被NPP的模拟显示,最近30 a我国热带雨林、落叶阔叶林以及有地被层的阔叶林的年均NPP减小,而混交林、常绿针叶林、落叶针叶林、有裸土的灌丛、草地以及作物的年均NPP均为增加趋势.由于采用了先进的农业技术,与自然条件下我国作物的年均NPP变化相比,我国实际的粮食单产在上述时期呈显著的增长,表明了人类活动对于我国陆地植被净初级生产力有着深刻的影响.

The Chinese Terrestrial NPP Simulation from 1971 to 2000

Based on the meteorological station data we used an Atmosphere-Vegetation Interaction Model(AVIM) that has been validated at regional and global scales to estimate the NPP(net primary production) variation of Chinese terrestrial ecosystems from 1971 to 2000 and its responses to the climate change.The Chinese terrestrial NPP variation from 0 to 987.67 gC·m^-2·a^-1,averaging from 340.78 to 367.38 gC·m^-2·a^-1,showing the increase tendency.For the different vegetation the tropical rain forest has the highest NPP values,average is 912.94 gC·m^-2·a^-1,and the lowest is Sparse shrub,averaging 230.99 gC·m^-2·a^-1.Our simulation results are consistent with other results of the Chinese terrestrial vegetation.During the 30 years the NPP of vegetation distributing in the southern China,such as tropical rain forest,Broad leaf deciduous trees and broadleaf trees with ground cover decrease and the Needle leaf trees in the northeastern China increases because of the regional climate change.Comparing with the cropland variation under the natural condition owing adopting the modern agriculture technology the actual crop productivity increases significantly from 1971 to 1998,reflecting the human activity influence on the Chinese terrestrial NPP variation.